What’s Vulnerable › Vulnerabilities

CVE-2026-3634: Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-17 · updated 2026-06-17
• Weakness: CWE-93

Description

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the `soup_message_headers_set_content_type()` function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Affected products

• GNOME libsoup: all versions
• Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0, 10.0

References

• https://access.redhat.com/security/cve/CVE-2026-3634
• https://bugzilla.redhat.com/show_bug.cgi?id=2445129
• https://gitlab.gnome.org/GNOME/libsoup/-/issues/485
• https://gitlab.gnome.org/GNOME/libsoup/-/issues/485

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